Unfortunately, the sources I read don't agree on what each action means. For example, according to one source,* to fan slowly means "I am married." But according to another** to fan slowly means, "Don't waste your time; I'm not interested."
Likewise, according to one***, fanning oneself quickly means "I am married." But yet another ****says the same action means" I love you so much."
Also, the modern reader might wonder why go to all the trouble of learning such an elaborate language? But I think it might work well for the very shy, the very tongue-tied, or the person who needs to get the message across but fears coming on too strong. Also, telling a man she's not interested in him might be easier to say in fan language than in speaking. How many times have you told a guy who asked you out that you were busy when you really wanted to tell him to buzz off?
So, unless I can make friends with Dr. Who and jump into his time machine to find out what, exactly, these gestures really meant during the Regency Era, we may never know. Still, here are a few hand signals on which my sources seem to agree:
Touching left cheek: no
Twirling in right hand: I love another
Open and shut: you are cruel
Presented shut: do you love me?
With handle to lip: Kiss me
In right hand in front of face: Follow me
Drawing across the cheek: I love you
Placing on left ear: Leave me alone
Placing closed fan to the right eye: When may I see you?
So far, all the heroines in my Regency Romance novels have done with a fan is to keep cool or use it as a shield behind which they speak quietly to another. I admit, however I'm intrigued by the subtle, demure way a woman might have communicated to a man without speaking a word. She'd just have to time it when he's looking and not one else is, or her secret feelings would no longer be secret.